Well, if you really want to hunt this "specimen", then I would suggest a day or 2 of just sight fishing, making notes where you see the fish, etc, etc. Then chum a bit in the areas the fish was sighted to increase the odds of the fish staying in the area. Fishing for a specific fish requires much more stealthy tactics. Perhaps try floating baits such as bread fly, etc. If possible (since the bottom is too grassy, etc) put out several rods at varying depths from the surface down to about 1ft from the bottom. The key thing is to have these rods out before the fish comes into the area, or at the least put the rods out carefully without spooking the fish when you cast. Sounds like a worthy challenge, good luck & keep us posted!